Abstract
At present, the research on the electrochemical reduction of CO2 (ECR-CO2) mainly focuses on the electrode material and the catalyst. However few studies involved the reactor and reaction conditions. In this study, the commercial available nano-Sn catalyst was coated on a gas diffusion electrode to form a working electrode (Sn/GDE), the influences of distance between the aonde and the cathode were systematically investigated in a reactor for ECR-CO2. The experiments show that for the electrode distance changed from 1.5 cm to 5.7 cm, both current density and Faradaic efficiency were decreased sharply from 34.6 to 10.4 mA cm-2 and 80% to 60%, respectively. However, the distance of 3.3 cm seems to be a critical point, at which the current density was no longer changed.
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